linux-kernel - Re: [PATCH] vmscan: add barrier to prevent evictable page in unevictable list

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Message-ID: <CAF1ivSaf8ER9yDWohudy-huiq5QHS8vE04R+4+nPTQihZ2MAmQ@mail.gmail.com>
Date:	Wed, 28 Sep 2011 23:04:05 +0800
From:	Lin Ming <mlin@...pku.edu.cn>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>
Subject: Re: [PATCH] vmscan: add barrier to prevent evictable page in
 unevictable list

On Wed, Sep 28, 2011 at 9:45 AM, Minchan Kim <minchan.kim@...il.com> wrote:
> When racing between putback_lru_page and shmem_unlock happens,

s/shmem_unlock/shmem_lock/

> progrom execution order is as follows, but clear_bit in processor #1
> could be reordered right before spin_unlock of processor #1.
> Then, the page would be stranded on the unevictable list.
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